Linear ADVANCED AT7200, Руководство пользователя

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AT7400 Owner Manual Rev. 2.0 – October 2006-10-23 Section 2 - 6/9
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2.7.2.1
Direct RF power, and reverse RF power. From the RF output directional coupler, module 4429.
2.7.2.2
Direct RF driver power, and reverse RF driver power. From the RF intermediate directional coupler,
module 4429.
2.7.2.3
+8V, from the DC/DC converter; module 4147.
2.7.2.4
+15V, from the DC/DC converter; module 4147.
2.7.2.5
The 12V/7Ah battery voltage.
From the connector CON-9 these readings feed the microcontroller CI-4, from where those are digitalized and
processed. By software decision, the microcontroller sets the nominal value for these readings 4V,
meaning, to all nominal values the +4V will be assigned, and will be available at the CON-9. These values are
transferred to the main LCD display on the MCU.
On the intermediate and final directional couplers, module 4488 and 4429, as well on the mains module, 4147,
there are test points where the +4V nominal reference voltage are set. For instance:
 Once on operation and at the time the transmitter is set for its nominal RF output
power, the trim pot TP01 at PCB CIM3128A located at the module 4429 should be
adjust on such way that the +4V is measured at pin 8, on the connector CON-9 located
at PCB CIM3297. More details will be shown on specific sections of this manual.
2.7.3. Alarm Detection
The system alarms are routed to MCU module 4459 via P1 and P2 connectors. These alarms are routed to CON-
5 at PCB CIM3297. These alarms are:
2.7.3.1
Lack of AC phase on mains, detected at module 4147.
2.7.3.2
Open fuse for fan #1, detected at module 4147.
2.7.3.3
Open fuse for fan #2, detected at module 4147.
(For 2 racks systems only).
At the time when the system is on normal operation, no alarms, a +5V voltage is sent to the CON-5 via P1-P2
connectors. When an abnormal condition happens, that requires attention and generates an alarm status; a
lower voltage is than sent, usually 0V. When a lower voltage is detected by the microcontroller, the transmission
is halted.
2.7.3.4
The alarm status is shown at the LCD screen on the front panel of the MCU. The alarms events are
classified in two categories regarding the time line occurrence:
2.7.3.4.1.
On going alarm situation, noted by the sign “!”.
2.7.3.4.2.
Old alarm situation, noted by the sign “#”.
At the time when an alarm source cease, the transmission is reestablished, and the “!” sign is switched to a “#”
sign, and registered. Old records can be manually erased by pressing the key “CLEAR” on the MCU front panel
keyboard.